91 lines
2.5 KiB
Dart
91 lines
2.5 KiB
Dart
import 'dart:typed_data';
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import 'package:flutter/widgets.dart';
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import 'package:logger/logger.dart';
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import 'package:myapp/core/image_cache.dart';
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import 'package:myapp/core/lru_map.dart';
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import 'package:myapp/core/thumbnail_cache.dart';
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import 'package:myapp/models/photo.dart';
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import 'package:myapp/ui/loading_widget.dart';
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import 'package:photo_view/photo_view.dart';
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class ZoomableImage extends StatefulWidget {
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final Photo photo;
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final Function(bool) shouldDisableScroll;
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ZoomableImage(
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this.photo, {
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Key key,
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this.shouldDisableScroll,
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}) : super(key: key);
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@override
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_ZoomableImageState createState() => _ZoomableImageState();
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}
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class _ZoomableImageState extends State<ZoomableImage> {
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ImageProvider _imageProvider;
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bool _loadedThumbnail = false;
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bool _loadedFinalImage = false;
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ValueChanged<PhotoViewScaleState> _scaleStateChangedCallback;
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@override
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void initState() {
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_scaleStateChangedCallback = (value) {
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if (widget.shouldDisableScroll != null) {
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widget.shouldDisableScroll(value != PhotoViewScaleState.initial);
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}
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};
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super.initState();
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}
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@override
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Widget build(BuildContext context) {
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if (!_loadedThumbnail && !_loadedFinalImage) {
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final cachedThumbnail = ThumbnailLruCache.get(widget.photo);
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if (cachedThumbnail != null) {
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_imageProvider = Image.memory(cachedThumbnail).image;
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_loadedThumbnail = true;
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}
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}
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if (!_loadedFinalImage) {
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if (ImageLruCache.get(widget.photo) != null) {
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final bytes = ImageLruCache.get(widget.photo);
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_onFinalImageLoaded(bytes, context);
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} else {
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widget.photo.getBytes().then((bytes) {
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if (mounted) {
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setState(() {
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ImageLruCache.put(widget.photo, bytes);
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_onFinalImageLoaded(bytes, context);
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});
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}
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});
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}
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}
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if (_imageProvider != null) {
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return PhotoView(
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imageProvider: _imageProvider,
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scaleStateChangedCallback: _scaleStateChangedCallback,
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minScale: PhotoViewComputedScale.contained,
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gaplessPlayback: true,
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);
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} else {
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return loadWidget;
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}
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}
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void _onFinalImageLoaded(Uint8List bytes, BuildContext context) {
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final imageProvider = Image.memory(bytes).image;
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precacheImage(imageProvider, context).then((value) {
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if (mounted) {
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setState(() {
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_imageProvider = imageProvider;
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_loadedFinalImage = true;
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});
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}
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});
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}
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}
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